it would be very d___ for us to travel to space ,if w___ aren't astronauts .

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itwouldbeveryd___forustotraveltospace,ifw___aren''tastronauts.itwouldbeveryd___forustotraveltospace,i

it would be very d___ for us to travel to space ,if w___ aren't astronauts .
it would be very d___ for us to travel to space ,if w___ aren't astronauts .

it would be very d___ for us to travel to space ,if w___ aren't astronauts .
it would be very difficuit for us to travel to space ,if we aren't astronauts .
如果我们不是宇宙航行员,那么游览太空将会是很艰难的.